Try using thes CVARs :-
r.raytracing.culling 0
r.RayTracing.Culling.Radius - Default would be like 10000 Increase upto maybe 50000
r.Nanite.MaxPixelsPerEdge - default is 1 but reduce like 0.2 to see effect
These are that help me the most for culling, but it may differ from Project to Project so you might need to try couple more things.